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Ethan
 Post subject: Collection with nested collections - Possible?
PostPosted: Mon Feb 28, 2005 1:43 pm 
Newbie

Joined: Wed Nov 12, 2003 4:57 pm
Posts: 14
Location: New York City
Hibernate version: 2.1.8 (but would switch to 3.0 if it can handle this)

Lets say I have three Objects:


Code:

public class Product {
     private List salesChannels;
}


public class SalesChannel {
     private List prices;

}


public class Price {
     private long price;
}


As you can see, Product has a List of sales channels and each sales channel has a list of prices. Is it possible to map this in hibernate? Near as I can tell, it is impossible to have a collection of collections. Is there a good work around?

Thanks,

Ethan Schreiber
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michael
 Post subject:
PostPosted: Mon Feb 28, 2005 2:09 pm 
Hibernate Team
Hibernate Team

Joined: Tue Sep 09, 2003 2:10 pm
Posts: 3246
Location: Passau, Germany
Not possible. Use an intermediate object.
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Ethan
 Post subject: intermediate object
PostPosted: Tue Mar 15, 2005 2:14 pm 
Newbie

Joined: Wed Nov 12, 2003 4:57 pm
Posts: 14
Location: New York City
Im not quite sure what you mean by intermediate object. Does this mean that if I want to save a Product, SalesChannel and Price I would need to do somethind like this:

Code:
   session.save(product);
   
   Iterator salesChannels = product.getSalesChannels().iterator();

   while (salesChannels.hasNext()) {
      SalesChannel salesChannel = (SalesChannel) salesChannels.next();
      session.save(salesChannel);
   }
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michael
 Post subject:
PostPosted: Tue Mar 15, 2005 3:30 pm 
Hibernate Team
Hibernate Team

Joined: Tue Sep 09, 2003 2:10 pm
Posts: 3246
Location: Passau, Germany
Ah sorry, missread your question.

You can of course map a class A containing a Set<B> where class B contains a Set<C>

what you can not do is map a Set<Set<X>>
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Ethan
 Post subject: it worked
PostPosted: Tue Mar 15, 2005 5:31 pm 
Newbie

Joined: Wed Nov 12, 2003 4:57 pm
Posts: 14
Location: New York City
thanks for your help Michael!
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